基于石灰苛化法研究CaO在含草酸盐稀铝酸钠溶液中的反应动力学与机理（英文）

基于石灰苛化法研究CaO在含草酸盐稀铝酸钠溶液中的反应动力学与机理（英文）Research on the reaction kinetics and mechanism of CaO in sodiu

CaO 基于石灰苛化法研究在含草酸盐稀铝酸钠溶液 中的反应动力学与机理（英文） ResearchonthereactionkineticsandmechanismofCaOin sodiumaluminatesolutioncontainingoxalatebasedonthelime causticizationmethod Abstract ThereactionkineticsandmechanismofCaOinsodium aluminatesolutioncontainingoxalatewerestudiedbythelime causticizationmethod.Theexperimentwasconductedata constanttemperature,andthereactionratewasdeterminedby measuringthepHvalueandtheamountofoxalatepresentinthe solutionatdifferentreactiontimes.Theresultsshowedthatthe reactionofCaOandsodiumoxalatewasafastandexothermic process,andthereactionratewasaffectedbytheconcentration ofsodiumoxalate,thetemperature,andthestirringspeed.The reactionmechanismwasproposedbasedontheexperimental data,whichsuggestedthatthereactionofCaOandsodium oxalateformedcalciumoxalateprecipitateandsodiumhydroxide, andtheformationofsodiumhydroxidepromotedthe causticizationofCaO.Thestudyprovidesatheoreticalbasisfor theselectionofsuitablepreparationmethodsforsodium aluminateandthecontrolofthereactionprocess. Keywords:CaO;sodiumaluminatesolution;oxalate;reaction kinetics;mechanism Introduction Sodiumaluminateisanimportantindustrialchemical,widely usedinthefieldsofwatertreatment,papermaking,andceramics. Thetraditionalmethodofpreparingsodiumaluminateisthe Bayerprocess,whichiscomplexandhasahighenergy consumption.Inrecentyears,anumberofnewmethodshave beendevelopedforthepreparationofsodiumaluminate, includingthelimecausticizationmethod,thehydrothermal method,andthealkalimeltingmethod.Amongthem,thelime causticizationmethodissimpleandhasalowenergy consumption,andiswidelyusedinindustry. Inthelimecausticizationmethod,calciumoxide(CaO)isused